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Class 9 old chapter names 2026-27: where each old NCERT chapter is now
If you search for "Gravitation class 9" or "Heron's formula class 9" and find nothing that matches your new textbook, this page is for you. From 2026-27, Class 9 uses new NCERT books: Exploration for Science (13 chapters) and Ganita Manjari for Maths, in two parts (chapters 1 to 8 in Part I, 9 to 14 in Part II). Their chapter names are new, and the topics are grouped differently. Below, each old chapter name is matched to where its topics now sit, with the page in the new book.
We read these locations in the new books ourselves, chapter by chapter; no practising teacher has checked this list yet. An old chapter rarely moves whole into one new chapter. Where a topic is now split across chapters, taught in Class 8 instead, or missing from the new Class 9 books, we say so. If you spot a mistake, please tell us. For which books are new this year and which are reprints, see what changed in the 2026-27 NCERT books.
How we matched them
- The old chapter names are from the contents pages of the earlier Class 9 NCERT books (the 2024-25 editions; NCERT's file names now hold the new books, so we read archived copies). CBSE's Class IX curriculum for 2025-26 still prescribed those books and lists the topics in each chapter, so we used it for what the old chapters contained.
- The new chapter names and page numbers come from the contents pages of Exploration and Ganita Manjari Parts I and II, and from searching each new chapter's text for the old topics.
- Page numbers are the printed page numbers of the new books.
Science: old chapters and where they are now
| Old chapter name | Where its topics are in 2026-27 |
|---|---|
| Matter in Our Surroundings | No Class 9 chapter with this name. The particle picture of matter and the three states are now in Class 8 Curiosity Chapter 7, Particulate Nature of Matter (states, page 101; evaporation, page 105). Class 9 Chapter 5 uses evaporation, boiling points and sublimation as ways to separate mixtures (sublimation, page 84). |
| Is Matter Around Us Pure | Mostly Class 9 Exploring Mixtures and their Separation (Chapter 5, from page 72): mixtures, suspensions and colloids (colloids, pages 86-87). Elements and compounds come back in Chapter 9. |
| Atoms and Molecules | Atomic Foundations of Matter (Chapter 9, from page 162): the laws of chemical combination (law of constant proportions, page 167), Dalton's ideas (page 168), and atomic and molecular masses (pages 179-180). |
| Structure of the Atom | Journey Inside the Atom (Chapter 8, from page 140): Thomson's and Rutherford's models (pages 142-143), valency, and isotopes and isobars (pages 156-157). |
| The Fundamental Unit of Life | Cell: The Building Block of Life (Chapter 2, from page 8): cell organelles such as the Golgi apparatus (page 17) and the cell theory (page 23). |
| Tissues | Tissues in Action (Chapter 3, from page 28): meristematic tissue in plants (pages 29-30), and animal tissues. |
| Motion | Describing Motion Around Us (Chapter 4, from page 48): position-time and distance-time graphs (pages 57-60) and uniform circular motion (page 66). |
| Force and Laws of Motion | How Forces Affect Motion (Chapter 6, from page 94): inertia (page 100), Newton's second law in terms of momentum (page 104) and the third law (pages 107-108). |
| Gravitation | No Class 9 chapter. Gravitational force (weight) appears as one of the forces in Chapter 6 (pages 95 and 97), and the acceleration due to gravity, g, is used in Chapter 7 (pages 117 and 126). We did not find the universal law of gravitation in Exploration. Buoyant force and Archimedes' idea are in Class 8 Curiosity Chapter 5, Exploring Forces (page 76), and pressure in Class 8 Pressure, Winds, Storms, and Cyclones (Chapter 6, from page 80). |
| Work and Energy | Work, Energy, and Simple Machines (Chapter 7, from page 116): work done by a force (page 117), conservation of mechanical energy (pages 126-127) and power in watts (page 129), plus simple machines. |
| Sound | Sound Waves: Characteristics and Applications (Chapter 10, from page 184): ultrasound and infrasound (page 199), reflection of sound and echo (pages 200-201). |
| Improvement in Food Resources | No Class 9 chapter. Plant breeding gets a short passage in Chapter 11, Reproduction: How Life Continues (page 217). We did not find the old chapter's crop and animal-farming topics as a chapter in Exploration. |
| Health and Diseases (in CBSE's 2025-26 Class IX course) | Not a Class 9 chapter. Health, communicable and non-communicable diseases are in Class 8 Curiosity Health: The Ultimate Treasure (Chapter 3, from page 28; non-communicable diseases, page 32). |
Two new Science chapters have no single old chapter behind them: Patterns in Life: Diversity and Classification (Chapter 12, from page 228), and Earth as a System: Energy, Matter, and Life (Chapter 13, from page 252). Chapter 1 (from page 1) introduces the book.
Maths: old chapters and where they are now
| Old chapter name | Where its topics are in 2026-27 |
|---|---|
| Number Systems | The World of Numbers (Part I Chapter 3, from page 41): rational numbers (page 46) and irrational numbers, with the proof that √2 is irrational (pages 53-55). We did not find rationalising denominators or the laws of exponents for real numbers there; exponents are taught in Class 8 Ganita Prakash Part 1, Power Play (Chapter 2, from page 19). |
| Polynomials | Split. Introduction to Linear Polynomials (Part I Chapter 2, from page 16) covers linear polynomials only, and Exploring Algebraic Identities (Part I Chapter 4, from page 68) covers the identities. We did not find the remainder theorem or the factor theorem in either part. |
| Coordinate Geometry | Orienting Yourself: The Use of Coordinates (Part I Chapter 1, from page 1). |
| Linear Equations in Two Variables | Two Variables, One Line (Part II Chapter 13, from page 85): the form ax + by + c = 0 (page 86), and now also solving a pair of such equations. |
| Introduction to Euclid's Geometry | No chapter. Statements and their converses, the groundwork for proof, are in Propositions and their Converses (Part II Chapter 9, from page 1). Euclid's name appears in Part II Chapter 11, The World of Algorithms, for his method of finding a gcd (pages 46-47), not for geometry. |
| Lines and Angles | No chapter of its own. Vertically opposite angles and transversals are used inside the proofs of Part II Chapter 12, Quadrilaterals (pages 57-58 and 62). The basics are taught earlier, in Class 6 Ganita Prakash, Lines and Angles (Chapter 2, from page 13), and Class 7 Part 1, Parallel and Intersecting Lines (Chapter 5: vertically opposite angles, page 108; transversals, page 114). |
| Triangles | No chapter of its own. The congruence tests are used in proofs elsewhere, for example SSS in Part I Chapter 5 on circles (page 99) and in Part II Chapter 12 (page 58). Congruence itself is taught in Class 7 Ganita Prakash Part 2, Geometric Twins (Chapter 1: SSS, page 6; SAS, page 10). |
| Quadrilaterals | Quadrilaterals (Part II Chapter 12, from page 51), including the midpoint theorem and its converse (pages 63-64). |
| Circles | I'm Up and Down, and Round and Round (Part I Chapter 5, from page 92): chords and the angles they subtend at the centre (pages 93 and 99). |
| Heron's Formula | Measuring Space: Perimeter and Area (Part I Chapter 6, from page 118), in a section on Heron's formula (pages 134-135). |
| Surface Areas and Volumes | Math of Space: Surface Area and Volume (Part II Chapter 14, from page 123). |
| Statistics | Partly. How Quantities Combine: Understanding Data (Part II Chapter 10, from page 8) works with averages, including the weighted average (pages 8 and 12). Mean and median are in Class 8 Ganita Prakash Part 2, Tales by Dots and Lines (Chapter 5, from page 103). We did not find histograms in either part of the new Class 9 book. |
Three new Maths chapters are not in this list because no old Class 9 chapter matches them: The Mathematics of Maybe: Introduction to Probability (Part I Chapter 7, from page 155), Predicting What Comes Next: Exploring Sequences and Progressions (Part I Chapter 8, from page 174), and The World of Algorithms (Part II Chapter 11, from page 37).
Practice guides for the new chapters
Each new chapter has a practice guide of our own:
- Science: Chapter 1, Cell, Tissues in Action, Describing Motion Around Us, Exploring Mixtures, How Forces Affect Motion, Work, Energy and Simple Machines, Journey Inside the Atom, Atomic Foundations of Matter, Sound Waves, Reproduction, Patterns in Life, Earth as a System.
- Maths Part I: Coordinates, Linear Polynomials, The World of Numbers, Algebraic Identities, Circles, Perimeter and Area, Probability, Sequences.
- Maths Part II: Propositions and their Converses, Understanding Data, The World of Algorithms, Quadrilaterals, Two Variables, One Line, Surface Area and Volume.
- Earlier-class maths chapters named above: Class 6 Lines and Angles, Class 7 Parallel and Intersecting Lines, Class 7 Geometric Twins, Class 8 Power Play, Class 8 Tales by Dots and Lines.
- The Class 8 science chapters named above: Particulate Nature of Matter, Health: The Ultimate Treasure, Forces and pressure and Pressure, Winds, Storms and Cyclones.
Where CMDLearn fits
CMDLearn is building an AI tutor for Classes 1 to 10 that explains a step and checks the child's working, but leaves the writing to the child. It is still in development, and no child uses it yet. If you would like to hear when there is something to try, you can join the waitlist.
Sources
All opened and read on 3 November 2026. Page numbers are printed page numbers.
- NCERT, Exploration: Textbook of Science for Grade 9 (First Edition 2026), contents and Chapters 1-13: ncert.nic.in/textbook/pdf/iesc1ps.pdf (chapters iesc101 to iesc113).
- NCERT, Ganita Manjari, Grade 9, Part I (2026), contents and Chapters 1-8: ncert.nic.in/textbook/pdf/iemh1ps.pdf (chapters iemh101 to iemh108).
- NCERT, Ganita Manjari, Grade 9, Part II (2026), contents and Chapters 9-14: ncert.nic.in/textbook/pdf/iemh2ps.pdf (chapters iemh201 to iemh206).
- NCERT, Curiosity: Textbook of Science for Grade 8 (Reprint 2026-27), Chapters 3, 5, 6 and 7: ncert.nic.in/textbook/pdf/hecu103.pdf, hecu105.pdf, hecu106.pdf and hecu107.pdf.
- NCERT, the earlier Science and Mathematics textbooks for Class IX (2024-25 editions), contents pages, read from Internet Archive copies of the old files: web.archive.org/web/20240615200445/https://ncert.nic.in/textbook/pdf/iesc1ps.pdf and web.archive.org/web/20240521/https://ncert.nic.in/textbook/pdf/iemh1ps.pdf
- NCERT, Ganita Prakash for Grade 6 (Chapter 2), Grade 7 Parts 1 and 2 (Part 1 Chapter 5, Part 2 Chapter 1) and Grade 8 Parts 1 and 2 (Part 1 Chapter 2, Part 2 Chapter 5) (Reprint 2026-27): ncert.nic.in/textbook/pdf/fegp102.pdf, gegp105.pdf, gegp201.pdf, hegp102.pdf and hegp205.pdf.
- CBSE, Class IX curriculum 2025-26, Science and Mathematics (the old course and its prescribed NCERT books): cbseacademic.nic.in/web_material/CurriculumMain26/Sec/Science_Sec_2025-26.pdf and cbseacademic.nic.in/web_material/CurriculumMain26/Sec/Maths_Sec_2025-26.pdf
Chapter names and page numbers are from the books above. The mapping and every sentence on this page are our own. This guide is general information; follow your teacher and your textbook.
Practise this class: Class 9 worksheets, chapter by chapter · free practice, marked instantly · timed revision papers